ImportSendingService::fillFiles

private function fillFiles(array $messages): array
{
	$files = $this->getFiles($messages);

	foreach ($messages as $index => $message)
	{
		if (isset($message['fileId']))
		{
			$messages[$index]['file'] = $files[(int)$message['fileId']] ?? null;
		}
	}

	return $messages;
}